The launch of Meta's AI agent Muse has reignited bets that consumer-grade artificial intelligence is finally hitting a mainstream inflection point, but Wall Street is split on whether this marks a genuine return to the AI trade or just another fleeting spike.

On September 21, the Nasdaq 100 jumped roughly 2.83% to reclaim the 30,000-point level, its highest close since June. Yet Goldman Sachs trading desk analyst Peter Callahan called it a "quiet surge" — trading activity scored just 3 out of 10, the S&P 500 equal-weight index rose a mere 18 basis points, and the gains were heavily concentrated in mega-cap tech names.

"This is one of the rare ~3% Nasdaq rallies I can recall that felt so subdued," Callahan noted.
The explosion of Muse-style products has directly opened up new demand for CPU chips, with ARM surging over 15% on the day, Intel climbing more than 12%, and AMD rising nearly 10%.
Meanwhile, credit markets are diverging from equities: investment-grade CDS spreads have widened to a five-month high, signaling skepticism about the rally's staying power. Next week's earnings report from Micron Technology is being viewed as the key validation point for whether the AI infrastructure trade can hold.

Muse: From Chatbot to an Agent That Gets Things Done

The trigger for all of this was Meta's consumer AI agent, Muse, which launched on September 8. Unlike traditional conversational AI, Muse can autonomously execute multi-step tasks — booking travel, managing calendars, and completing e-commerce purchases — running continuously in the background rather than waiting for user commands.

Wells Fargo analyst Ken Gawrelski, citing SensorTower data in a client note, highlighted the following:

Muse hit 264,000 daily downloads on September 19, marking the third straight day above 200,000.

Daily active users peaked at 448,000 by day ten.

For comparison, ChatGPT took nearly a year to reach 200,000 daily downloads and 49 days to hit 450,000 daily active users.

Gawrelski raised his Meta price target from $640 to $796, maintaining an "Overweight" rating, and wrote: "Muse marks the shift of consumer AI from chatbots to AI assistants, and whoever gets to market first has the advantage — because the more an AI assistant is used, the more valuable it becomes."

Goldman Sachs trader Rich Privorotsky pointed out the strategic significance directly: "Meta has essentially built a direct-to-consumer agent factory — shopping, calling, subscriptions, admin tasks, increasingly acting on your behalf. The end state is clear: everyone will have dozens of agents helping with groceries, bill payments, holidays, and school arrangements. Your productivity becomes you plus your team of agents. This is a massive efficiency release and a massive compute multiplier."

Meta shares surged roughly 11% to 12% on the day, hitting their highest level since October 2025.

Why CPUs, Not Just GPUs, Are the Story

The structure of the chip rally reveals the market's bet on a shifting AI architecture. On September 21, ARM Holdings (ASX: ARM) jumped over 15%, Intel climbed more than 12%, and AMD rose nearly 10% — all three are core CPU players, not the traditional AI compute narrative's usual protagonist, Nvidia.

According to market intelligence firm Vital Knowledge, early generative AI relied mainly on GPUs for isolated text and image generation tasks. AI agents, by contrast, need to run continuous background processes, logic loops, and local data orchestration, making agentic AI far more CPU-intensive than GPU-heavy workloads.

In other words, the explosion of Muse-style products has directly created new demand for CPU silicon.

AMD touched the $1 trillion market cap threshold for the first time on the day, surpassing JPMorgan and joining the ranks of Eli Lilly and Berkshire Hathaway. Goldman's Peter Callahan noted in a flash note: "If AMD overtakes those two names going forward, the S&P 500's top ten companies will all be TMT firms, each with a market cap above $1 trillion."

Additionally, reports indicate that OpenAI is accelerating development of a Muse-like consumer agent, with expectations of an industry arms race further lifting valuations across the CPU and cloud computing supply chain.

A Quiet Surge with Sharp Internal Divergence

Goldman's TMT desk flash note captured the session's character in one line: "The Nasdaq is back above 30,000, but this is one of the quietest ~3% rallies I can recall."

The day's data tells the story:

The S&P 500 equal-weight index rose just ~18 basis points, while the S&P 500 itself gained ~130 basis points — a spread that ranks among the top five single-day gaps in the past five-plus years.

The SOX semiconductor index posted a cumulative gain of nearly 12% over five trading days, its strongest five-day run since early August 2025.

Options activity hit a one-month high, with single-day call volume on AMD and Intel each exceeding 1 million contracts, near year-to-date peaks.

Media reports noted large tech call buying at the open, triggering an unusual combination of "spot up, volatility also up" — a hallmark of options-driven moves rather than fundamentals-led gains.

Goldman's desk also recorded roughly balanced buy/sell flows on the day: long-only funds (LO) were net buyers in communication services and information technology, while hedge funds (HF) added in communication services, financials, and consumer discretionary — but overall activity remained muted.

Investors Are Skeptical: Fundamentals Are Solid, But the Move Feels Too Fast

Goldman's TMT flash note directly captured investors' reactions: "Clients acknowledge the fundamentals are solid, but sentiment indicators are more cautious — we received a flood of 'this is moving too fast' and 'where's the price target?' inquiries."

Callahan noted this echoes recent conversations at Goldman's technology conferences, where investors show clear tension over whether to fully "re-enter the AI infrastructure trade." The reason: at the macro level, oil prices and rates pressure have recently overshadowed healthy fundamental signals like supply-demand commentary, return-on-capital data, and product updates. "It seems to be forming a pattern of 'buyers waiting at higher levels,'" he said.

In short: fundamentals are fine, but macro noise is keeping investors from chasing highs.

The Credit Market Sends a Different Signal

The equity market's optimism is not backed by credit markets. Bloomberg macro strategist Frank Monkam analyzed that despite the S&P 500 near record highs, investment-grade credit quality — as measured by 5-year investment-grade CDS — has deteriorated to a five-month low, and this divergence has widened steadily since the Fed's rate hike this month.

Monkam wrote: "Equities continue to price in resilient growth and earnings, plus a more optimistic narrative. Credit is doing the math, demanding higher risk compensation for corporates. This apparent mispricing begs the question: which market has the wrong read on risk premia? I lean toward the signal from higher up the capital structure ultimately having the final say."

Two markets, looking at the same corporate balance sheets, are arriving at very different answers.

Oil and Rates: Temporary Relief or a Real Turning Point?

Another macro backdrop to this tech rally is the pullback in oil prices. Brent crude fell below $100 per barrel. Satellite data showed Saudi Arabian oil loadings at Persian Gulf ports jumped sharply over the weekend to their highest since June, indicating the kingdom has shifted export routes back through the Strait of Hormuz after Red Sea pipeline disruptions from drone attacks.

The drop in oil helped push the 10-year Treasury yield back below 5%. Goldman's Rich Privorotsky characterized rates and rates volatility as "the biggest macro risk right now," noting: "The risk of rates and energy prices decoupling persists — oil has come down, but the effects of secondary inflation and global rate shocks are already baked in."

The Next Catalyst: Micron's Earnings

Goldman's TMT flash note closed by flagging the next focus for markets: "Away from conferences and geopolitics, the next catalyst on my radar is next week's Micron Technology earnings."

As a core supplier of AI memory chips, Micron Technology's report will directly test the real strength of AI infrastructure demand. Notably, within this round of chip gains, memory stocks have clearly lagged — SanDisk fell about 3% on the day, while Western Digital and Seagate were roughly flat — a sharp contrast to the CPU explosion.

Whether Micron Technology can bridge this gap will be a key reference for the market in judging whether the "return to AI trade" is sustainable.